java.nio.channels.spi.AbstractSelectableChannel#isOpen()源码实例Demo

public void pauseSelects( AbstractSelectableChannel channel ) {

      //System.out.println( "pauseSelects: " + channel + " - " + Debug.getCompressedStackTrace() );

      if( channel == null ) {
        return;
      }

      SelectionKey key = channel.keyFor( selector );

      if( key != null && key.isValid() ) {
        key.interestOps( key.interestOps() & ~INTEREST_OP );
      }
      else {  //channel not (yet?) registered
        if( channel.isOpen() ) {  //only bother if channel has not already been closed
          try{  register_cancel_list_mon.enter();

            paused_states.put( channel, Boolean.TRUE);  //ensure the op is paused upon reg select-time reg

          }
          finally{  register_cancel_list_mon.exit();  }
        }
      }
    }
 

public void pauseSelects( AbstractSelectableChannel channel ) {
  
  //System.out.println( "pauseSelects: " + channel + " - " + Debug.getCompressedStackTrace() );
  
  if( channel == null ) {
    return;
  }
  
  SelectionKey key = channel.keyFor( selector );
  
  if( key != null && key.isValid() ) {
    key.interestOps( key.interestOps() & ~INTEREST_OP );
  }
  else {  //channel not (yet?) registered
    if( channel.isOpen() ) {  //only bother if channel has not already been closed
      try{  register_cancel_list_mon.enter();
      
        paused_states.put( channel, new Boolean( true ) );  //ensure the op is paused upon reg select-time reg

      }
      finally{  register_cancel_list_mon.exit();  }
    }
  }
}
 

public static void close(AbstractSelectableChannel channel) {
    if (channel != null && channel.isOpen()) {
        try {
            channel.close();
        } catch (IOException e) {
            LOGGER.error("Fail to close channel", e);
        }
    }
}